Botrytis squamosa

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Botrytis squamosa

Botrytis squamosa is a plant pathogen that causes the disease known as onion smudge. It primarily affects onions and related crops, leading to significant economic losses in agriculture.

Symptoms

Symptoms of infection by Botrytis squamosa include the appearance of dark, water-soaked lesions on the leaves and bulbs of affected plants. These lesions may develop a fuzzy, gray mold as the disease progresses. In severe cases, the entire plant may become infected, leading to wilting and decay.

Disease Cycle

Botrytis squamosa overwinters in plant debris and soil, where it can survive for extended periods. The pathogen produces spores that are dispersed by wind, water, and insects, allowing it to infect new plant hosts. Infection typically occurs through wounds or natural openings in the plant tissue.

Management

Effective management of Botrytis squamosa involves a combination of cultural practices, such as crop rotation and sanitation, and chemical control methods. Fungicides can be used to prevent the spread of the disease, especially during periods of high humidity and rainfall.

Prevention

To prevent the spread of Botrytis squamosa, it is important to practice good field hygiene, including the removal of infected plant debris and the use of disease-resistant cultivars. Proper irrigation and ventilation can also help reduce the risk of infection.